iwlwifi: generalize iwlwifi init flow

This patch creates handlers to support
iwlwifi init flow for multiple HWs

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -114,6 +114,151 @@ static const u16 default_tid_to_tx_fifo[] = {
 
 #endif	/*CONFIG_IWL4965_HT */
 
+/* check contents of special bootstrap uCode SRAM */
+static int iwl4965_verify_bsm(struct iwl_priv *priv)
+{
+	__le32 *image = priv->ucode_boot.v_addr;
+	u32 len = priv->ucode_boot.len;
+	u32 reg;
+	u32 val;
+
+	IWL_DEBUG_INFO("Begin verify bsm\n");
+
+	/* verify BSM SRAM contents */
+	val = iwl_read_prph(priv, BSM_WR_DWCOUNT_REG);
+	for (reg = BSM_SRAM_LOWER_BOUND;
+	     reg < BSM_SRAM_LOWER_BOUND + len;
+	     reg += sizeof(u32), image++) {
+		val = iwl_read_prph(priv, reg);
+		if (val != le32_to_cpu(*image)) {
+			IWL_ERROR("BSM uCode verification failed at "
+				  "addr 0x%08X+%u (of %u), is 0x%x, s/b 0x%x\n",
+				  BSM_SRAM_LOWER_BOUND,
+				  reg - BSM_SRAM_LOWER_BOUND, len,
+				  val, le32_to_cpu(*image));
+			return -EIO;
+		}
+	}
+
+	IWL_DEBUG_INFO("BSM bootstrap uCode image OK\n");
+
+	return 0;
+}
+
+/**
+ * iwl4965_load_bsm - Load bootstrap instructions
+ *
+ * BSM operation:
+ *
+ * The Bootstrap State Machine (BSM) stores a short bootstrap uCode program
+ * in special SRAM that does not power down during RFKILL.  When powering back
+ * up after power-saving sleeps (or during initial uCode load), the BSM loads
+ * the bootstrap program into the on-board processor, and starts it.
+ *
+ * The bootstrap program loads (via DMA) instructions and data for a new
+ * program from host DRAM locations indicated by the host driver in the
+ * BSM_DRAM_* registers.  Once the new program is loaded, it starts
+ * automatically.
+ *
+ * When initializing the NIC, the host driver points the BSM to the
+ * "initialize" uCode image.  This uCode sets up some internal data, then
+ * notifies host via "initialize alive" that it is complete.
+ *
+ * The host then replaces the BSM_DRAM_* pointer values to point to the
+ * normal runtime uCode instructions and a backup uCode data cache buffer
+ * (filled initially with starting data values for the on-board processor),
+ * then triggers the "initialize" uCode to load and launch the runtime uCode,
+ * which begins normal operation.
+ *
+ * When doing a power-save shutdown, runtime uCode saves data SRAM into
+ * the backup data cache in DRAM before SRAM is powered down.
+ *
+ * When powering back up, the BSM loads the bootstrap program.  This reloads
+ * the runtime uCode instructions and the backup data cache into SRAM,
+ * and re-launches the runtime uCode from where it left off.
+ */
+static int iwl4965_load_bsm(struct iwl_priv *priv)
+{
+	__le32 *image = priv->ucode_boot.v_addr;
+	u32 len = priv->ucode_boot.len;
+	dma_addr_t pinst;
+	dma_addr_t pdata;
+	u32 inst_len;
+	u32 data_len;
+	int i;
+	u32 done;
+	u32 reg_offset;
+	int ret;
+
+	IWL_DEBUG_INFO("Begin load bsm\n");
+
+	/* make sure bootstrap program is no larger than BSM's SRAM size */
+	if (len > IWL_MAX_BSM_SIZE)
+		return -EINVAL;
+
+	/* Tell bootstrap uCode where to find the "Initialize" uCode
+	 *   in host DRAM ... host DRAM physical address bits 35:4 for 4965.
+	 * NOTE:  iwl4965_initialize_alive_start() will replace these values,
+	 *        after the "initialize" uCode has run, to point to
+	 *        runtime/protocol instructions and backup data cache. */
+	pinst = priv->ucode_init.p_addr >> 4;
+	pdata = priv->ucode_init_data.p_addr >> 4;
+	inst_len = priv->ucode_init.len;
+	data_len = priv->ucode_init_data.len;
+
+	ret = iwl_grab_nic_access(priv);
+	if (ret)
+		return ret;
+
+	iwl_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
+	iwl_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
+	iwl_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG, inst_len);
+	iwl_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG, data_len);
+
+	/* Fill BSM memory with bootstrap instructions */
+	for (reg_offset = BSM_SRAM_LOWER_BOUND;
+	     reg_offset < BSM_SRAM_LOWER_BOUND + len;
+	     reg_offset += sizeof(u32), image++)
+		_iwl_write_prph(priv, reg_offset, le32_to_cpu(*image));
+
+	ret = iwl4965_verify_bsm(priv);
+	if (ret) {
+		iwl_release_nic_access(priv);
+		return ret;
+	}
+
+	/* Tell BSM to copy from BSM SRAM into instruction SRAM, when asked */
+	iwl_write_prph(priv, BSM_WR_MEM_SRC_REG, 0x0);
+	iwl_write_prph(priv, BSM_WR_MEM_DST_REG, RTC_INST_LOWER_BOUND);
+	iwl_write_prph(priv, BSM_WR_DWCOUNT_REG, len / sizeof(u32));
+
+	/* Load bootstrap code into instruction SRAM now,
+	 *   to prepare to load "initialize" uCode */
+	iwl_write_prph(priv, BSM_WR_CTRL_REG, BSM_WR_CTRL_REG_BIT_START);
+
+	/* Wait for load of bootstrap uCode to finish */
+	for (i = 0; i < 100; i++) {
+		done = iwl_read_prph(priv, BSM_WR_CTRL_REG);
+		if (!(done & BSM_WR_CTRL_REG_BIT_START))
+			break;
+		udelay(10);
+	}
+	if (i < 100)
+		IWL_DEBUG_INFO("BSM write complete, poll %d iterations\n", i);
+	else {
+		IWL_ERROR("BSM write did not complete!\n");
+		return -EIO;
+	}
+
+	/* Enable future boot loads whenever power management unit triggers it
+	 *   (e.g. when powering back up after power-save shutdown) */
+	iwl_write_prph(priv, BSM_WR_CTRL_REG, BSM_WR_CTRL_REG_BIT_START_EN);
+
+	iwl_release_nic_access(priv);
+
+	return 0;
+}
+
 static int iwl4965_init_drv(struct iwl_priv *priv)
 {
 	int ret;
@@ -4789,6 +4934,10 @@ static struct iwl_hcmd_utils_ops iwl4965_hcmd_utils = {
 
 static struct iwl_lib_ops iwl4965_lib = {
 	.init_drv = iwl4965_init_drv,
+	.hw_nic_init = iwl4965_hw_nic_init,
+	.is_valid_rtc_data_addr = iwl4965_hw_valid_rtc_data_addr,
+	.alive_notify = iwl4965_alive_notify,
+	.load_ucode = iwl4965_load_bsm,
 	.eeprom_ops = {
 		.verify_signature  = iwlcore_eeprom_verify_signature,
 		.acquire_semaphore = iwlcore_eeprom_acquire_semaphore,

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -89,9 +89,18 @@ struct iwl_hcmd_utils_ops {
 struct iwl_lib_ops {
 	/* iwlwifi driver (priv) init */
 	int (*init_drv)(struct iwl_priv *priv);
+	/* nic init */
+	int (*hw_nic_init)(struct iwl_priv *priv);
+	/* alive notification */
+	int (*alive_notify)(struct iwl_priv *priv);
+	/* check validity of rtc data address */
+	int (*is_valid_rtc_data_addr)(u32 addr);
+	/* 1st ucode load */
+	int (*load_ucode)(struct iwl_priv *priv);
+	/* rfkill */
+	void (*radio_kill_sw)(struct iwl_priv *priv, int disable_radio);
 	/* eeprom operations (as defined in iwl-eeprom.h) */
 	struct iwl_eeprom_ops eeprom_ops;
-	void (*radio_kill_sw)(struct iwl_priv *priv, int disable_radio);
 };
 
 struct iwl_ops {